Nut-lock.



PATENTED JUNE 2, 1908.

B. B. MARTIN.

NUT LOCK.

APPLICATION FILED JAN. 3, 1908.

Allan/(1 ELIJAH B. MARTIN, OF TEKAMAH, NEBRASKA.

NUT-LOCK.

Specification of Letters Patent. Application filed January 3, 1908.Serial No. 409,210.

Patented June 2, 1908.

To all whom it may concern:

Be it known that I, ELIJAH B. MARTIN, a citizen of the United States,residin a Tekamah, in the county of Burt and tate of Nebraska; haveinvented certain new and useful Improvements in Nut-Locks, of which thefollowing is a specification.

The present invention relates to improvements in nut locks, and has forits object the provision of a device of this character which will bestrong and durable, easily manipulated, and one which will perform thefunction of holding the nut locked permanently on the bolt, as will bemore fully pointed out hereinafter.

In the accompanying drawings I have illustrated one example of thephysical embodiment of my invention, constructed accordin to the bestmode I have so far devised Tor the practical application of theprinciples. A

Referring to the drawings: Figure 1 is a side' elevation of the device,showing both nuts, (the nut secured upon a bolt, and'the lock nut inoperative position) and bolt. Flg. 2 is a view similar to Fig. 1, thetwo nuts bemg shown in section. Fig. 3 is an end view of the parts asseen in Fig. 1 from the right end, and Fig.4 illustrates the bolt nut inelevation and the lock nut adjacent thereto, in section.

The invention contem lates the use of a nut to perform the functions ofan ordinary nut and provided with right hand threads .for engagementwith complementary threads of a bolt, and a lock nut provided withinterior left hand threads for engagement with com lementary exteriorthreads upon an extenslonof the bolt nut, the lock nut to act as acompressor nut, which through the medium of certain devices andconstructions,

compresses the threads of the bolt nut permanent'ly on the bolt threads.

In the drawings the numeral 1 designates a bolt of suitable constructionand convenient size; 2, the bolt head; 3, the threaded end of the bolt;4., the bolt nut pro er fashioned to receive a wrench or other too forturning; 5, the threaded extension of the bolt nut; 6, a'smooth ta eredportion of said extension; 7, a series oi slits or kerfs, four beingillustrated cutin and extending the length of the extension atdiametrically opposite points therein; 8, the lock or compresser nut,fashioned to receive a wrench or other tool for the conditions set forthas the object turning; '9, interior threads cut in the nut 8; 10, asmooth annular surface adjacent said threads 9; 11, a ring or annularprojection formed at the inner end of the nut 8.

It will be observed that the bolt threads and interior threads of thebolt nut are right hand threads, that is, they extend in a direction sothat the nut is screwed onto the bolt fromleft to right, and that theexterior threads of the extension 5 and interior threads 9 of thecompressor nut are left hand threads, requirin that the nut 8 be screwedfrom right to. left, when securing the bolt nut, thus securely clampingthe nut4 through 1 the medium of the extension on the bolt.

In 0 crating the device, the bolt nut is screwe home. The compressor nutis then entered over the extension of the bolt nut and turned in the oposite direction from that in which the b0 t nut was turned. As the nut.8 advances u on the extension of the bolt nut, the annu ar ring orprojection 11 rides over the tapered portion 6 of the extension andcompresses said extension upon the threads of the bolt, the kerfs orslits 7 allowing a compression of the extension in manner wellunderstood, and the bolt nut is thus firmly locked upon its threads. 7

The construction whereby the bolt nut and compressor nut are turnedandscrewed home'in opposite directions is an essential feature of myinvention, and the means employed i. e. the tapered portion of theextension and the annular ring to ride down the extension, for securingthe bolt nut on the bolt threads I consider a simple and eflicient meansfor the pur ose.

By the use of the b0 t nut with its extension threaded its entire len thon the interior, and threaded exteriory a part of its length, combinedwith the compressor nut rovided with threads only a art of its ength,the compressor nut may e screwed into close contact with the bolt nut,and thus be compacted in order to present as little obstruction aspossible, yet at the same time affording ample surface for the use of atool.'

When the compressor nut is screwed home upon the bolt nut the latter isheld in permanent position,

From the above description taken in connection with thedrawings it isevident that I have provided a lock nut which will fulfil of theinvention.

Having thus fully described my invention, what I c aim as new and desireto secure by Letters Patent is: y A bolt-engaging-nut interiorlythreaded 5 and having an externally threaded extension, said extensionprovided with kerfs and formed with a smooth taperin portion; combinedwith a compressor nut aving internal threads disposed o positely to the10 threads of the bolt nut ans extending part way through said nut, andan annular proi'ecting ring formed at the end of said nut arger indiameter than the diameter of the threads thereon for engagement withsaid ta ering portion of the extension.

testimony whereof I affix my signature in presence of two witnesses.

ELIJ AH B. MARTIN.

Witnesses HENRY M. HOPEWELL, JOHN P. MERRITT.

